Water soluble quaternized benzthiazole phenylazopyridine dyestuffs

ABSTRACT

Azo dyestuffs devoid of carboxylic acid or sulphonic acid groups and of the formula (I)   wherein R represents an optionally substituted alkyl or aralkyl radical, R1 represents hydrogen, an amino or substituted amino radical, or an optionally substituted alkyl, aralkyl, cycloalkyl or aryl radical, R2 may represent hydrogen, an optionally substituted alkyl, aralkyl, cycloaalkyl or aryl radical, a cyano radical, a nitro radical, halogen, an amino or substituted amino radical or a radical of the formula COR6, COOR6, CONR6R7 or SO2NR6R7 wherein R6 and R7 independently represent hydrogen or optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radicals or taken together with the N atom form a 5 or 6 membered ring, R3 may represent hydrogen or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical or a hydroxy, cyano, -COR6, COOR6 or CONR6R7 radical or R2 and R3 taken together may represent a 5, 6 or 7 membered ring either saturated or unsaturated fused to the pyridone ring, R4 and R5 represent non-ionogenic substituents, X represents an anion and m and n are integers from 1 to 3. The dyestuffs are useful for the colouration of polymeric materials especially polyacrylonitrile and blends thereof. The dyestuffs give valuable shades of high tinctorial strength and possess rapid dyeing characteristics. Dyeings of good fastness proportions to washing and light are obtained with the dyestuffs of this invention.

United States Patent [1 1 [111 3,884,899 Leng et a1. May 20, 1975 WATER SOLUBLE QUATERNIZED Primary Examiner-Henry R. .liles BENZTHIAZOLE PHENYLAZOPYRIDINE DYESTUFFS [75] Inventors: John Lindley Leng; David Frederick Newton, both of Manchester, England [73] Assignee: Imperial Chemical Industries Limited, London, England a 5 i (R l I i l L R [22] Filed: Apr. 9, 1973 [2]] Appl. No.: 349,191

[30] Foreign Application Priority Data Apr. 17, 1972 United Kingdom 17583/72 [52] US Cl 260/146 R; 260/155; 260/156 [51] Int. Cl. C09c 29/36 [58] Field of Search 260/155, 156, 146

[56] References Cited UNITED STATES PATENTS 2,857,372 10/1958 Straley et al 260/156 2,872,440 2/1959 Davies .j. 260/155 2,893,816 7/1959 Tsang et al, 260/156 3,086,002 4/1963 Baumann et al l 260/155 3,132,132 5/1964 Suzuki et al. 260/158 3,133,052 5/1964 Merion et al. 260/155 3,487,066 12/1969 Ritter et al 260/156 3,585,182 6/1971 Straley et al 260/155 3,657,214 4/1972 Berrie et a1. 260/156 3,664,996 5/1972 Berrie et a1. 260/156 Assistant ExaminerRobert W. Ramsuer Attorney, Agent, or FirmCushman, Darby & Cushman [57] ABSTRACT Azo dyestuffs devoid of carboxylic acid or sulphonic acid groups and of the formula (I) wherein R represents an optionally substituted alkyl or aralkyl radical, R represents hydrogen, an amino or substituted amino radical, or an optionally substituted alkyl, aralkyl, cycloalkyl or aryl radical, R may represent hydrogen, an optionally substituted alkyl, aralkyl, cycloaalkyl or aryl radical, a cyano radical, a nitro radical, halogen, an amino or substituted amino radical or a radical of the formula COR, COOR represent non-ionogenic substituents, X represents an anion and m and n are integers from 1 to 3.

The dyestuffs are useful for the colouration of polymeric materials especially polyacrylonitrile and blends thereof. The dyestuffs give valuable shades of high tinctorial strength and possess rapid dyeing characteristics. Dyeings of good fastness proportions to washing and light are obtained with the dyestuffs of this invention.

3 Claims, No Drawings WATER SOLUBLE QUATERNIZED BENZTHIAZOLE PHENYLAZOPYRIDINE DYESTUFFS This invention relates to azo dyestuffs which are valuable for the colouration of polymeric textile materials in the form of fibres, films, threads, tapes or woven materials and particularly polymeric textile materials comprising polymers and copolymers of acrylonitrile or dicyanoethylene, and acid-modified polyesters and polyamides.

According to the present invention there are provided azo dyestuffs devoid of carboxylic acid or sulphonic acid groups and of the formula (I) wherein R represents an optionally substituted alkyl or aralkyl radical, R represents hydrogen, an amino or substituted amino radical, or an optionally substituted alkyl, aralkyl, cycloalkyl or aryl radical, R may represent hydrogen, an optionally substituted alkyl, aralkyl, cycloalkyl or aryl radical, a cyano radical, a nitro radical, halogen, an amino or substituted amino radical or a radical of the formula COR COOR CONR R or SO NR R wherein R and R independently represent hydrogen or optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radicals or taken together with the N atom form a or 6 membered ring, R may represent hydrogen or an optionally substituted alkyl, aralkyl, cycloalkyl, aryl or heterocyclic radical or a hydroxy, cyano, COR COOR or CONR"'R radical or R and R taken together may represent a 5, 6 or '7 membered ring either saturated or unsaturated fused to the pyridone ring, R and R represent non-ionogenic substituents, X represents an anion and m and n are integers from 1 to 3.

The dyestuffs of the invention exist in a number of possible tautomeric forms. For convenience they have been formulated in one of these forms but it is to be understood that the invention relates to the dyestuff in any of the possible tautomeric forms.

Examples of R include methyl, ethyl, ,B-carbamidoethyl, B-hydroxyethyl, benzyl, 4'-methylbenzyl and a-chloro-B-hydroxypropyl.

Examples of R include hydrogen, amino, methyl, npropyl, ethyl, B-hydroxy ethyl, y-methoxypropyl, isopropyl, phenyl, tolyl, anisyl, ,B-aminoethyl, n-butyl, isobutyl, lauryl, benzyl, methoxyphenyl, nitrophenyl such as o-nitrophenyl and p-nitrophenyl, p-aminophenyl, cyclohexyl chlorophenyl such as, 0-, mand pchlorophenyl and 2,5 '-dichlorophenyl and a-naphthyl.

Examples of R include hydrogen, cyano, CONH carbondiethylamide, carbethoxy, methyl, n-butyl, ethyl, nitro, carbamoyl amino, acylamino such as acetylamino, benzoylamino and chloro.

Examples of R include hydrogen, methyl, ethyl, phenyl, carbamoyl, carboethoxy, acetoxy, acetamido, diethylacetamido, cyano, p-hydroxy phenyl, p-methoxy phenyl and hydroxy.

Examples of R and R taken together which result in the formation of a 5,6- or 7 membered ring include trimethylene, tetramethylene, pentamethylene and the group -Cl-l=CH-CH=CH which forms the isoquinoline nucleus with the pyridone ring.

Examples of R include hydrogen, methyl, chloro, methoxy and ethoxy.

Examples of R include methyl, chloro, methoxy and ethoxy.

- Examples of R and R include hydrogen, methyl and ethyl.

Examples of the anion X include chloride, bromide, iodide, tetrachlorozincate, bisulphate, nitrate, sulphate, sulphamate, phosphate or borate or organic anions such as acetate, propionate, methylsulphate and p-tolylsulphonate. In those cases where the anion is polyvalent the dyestuffs will contain a corresponding molar proportion of the cationic part of the dyestuff.

A preferred class of dyestuffs of the invention are those of the formula:

wherein R. R" and X are as hereinbefore defined. R is an optionally substituted alkyl. aryl or aralkyl radical. R is hydrogen. cyano. or an optionally substituted alkyl radical and R is hydrogen or an optionally' substituted alkyl or aryl radical.

In a further embodiment of the present invention there is provided a process for manufacture of the soluble azo dyestuffs of the invention by reacting insoluble azo dyestuffs of the general formula:

with an alkylating agent.

As examples of alkylating agents there may be mentioned dialkyl sulphates such as diethyl sulphate and dimethyl sulphate. alkyl toluene sulphonates such as methyl p-toluene sulphonate. halides such as methyl bromide, ethyl bromide. methyl iodide, ethyl iodide, benzyl chloride or bromide, B-bromopropionamide.

The alkylating reaction may be effected in an inert organic solvent such as benzene. toluene. xylene. chlorobenzene, nitrobenzene. acetone. carbon tetrachloride. tetrachloroethane or B-ethoxyethanol, but in certain cases it is possible and even preferable to use a medium consisting of the alkylating agent or of water or a water-miscible organic solvent such as acetic acid.

The alkylating agent may be used in considerable excess. for example up to 6 moles for each mol. of dyestuff. Suitable temperatures are from 20 to 150C.

When the reaction is effected in hydrophobic organic solvents the alkylated dyestuff is normally insoluble and may be isolated by filtration. If desired the alkylated dyestuffs may be isolated from aqueous solution by precipitation in the form of a salt such as tetrachlorozincate obtained by adding zinc chloride to the aqueous solution.

Insoluble azo dyestuffs which may be used as starting materials in the alkylation process may be made by diazotising a 2-(aminophenyll-benzthiazole of the general formula (R va and coupling the resultant diazo compound with a compound of the formula wherein R. R'-. R R. R and n are as hereinbefore stated.

Z-(Aminophenyl)benzthiazoles which may be used as diazo components include 2-(4'-aminophenyl)-6-methylbenzthiazole 2-(4'-amino-3-methylphenyl)--l.6-

dimethylbenzthiazole 2-(2'-aminophenyli-4-methylbenzthiazole 2-(4'-aminophenyl)benzthiazole there may be used for example: l-amino-4-methyl-3cyano-o-hydroxy-pyrid-2-one l-methyl-3-cyano-4-methyl-6-hydroxypyrid-2'one 1-ethyl-3-cyano-4-methyl-6-hydroxypyrid-2-one l-B-hydroxyethyl-4-methyl-6-hydroxypyrid-Z-one l-'y-methoxypropyl-4-methyl-o-hydroxypyrid-l-one l-phenyl-3-cyano-4-methyl-o-hydroxypyrid-2-one l-p-tolyl-3-cyano-4-methyl--hydroxypyrid-Z -one l-p-anisyl-3-cyano-4-methyl-o-hydroxypyrid-2-one l-phenyl-3-cyano-4-phenyl-6-hydroxypyrid-2-one l-p-tolyl-3-cyano-4-phenyl-o-hydroxypyrid-2-one l-p-anisyl-3-cyano-4-phenyl-6-hydroxypyrid-2-one l-phenyl-3-carbonamido-4-methyl-o-hydroxypyrid- Z-one l-phenyl-3-carbonamido-4-methyl-o-hydroxypyrid- Z-one l-phenyl-3-carbonamido-4-phenyl-o-hydroxypyrid- Z-one l-phenyl-3-carbethoxy-4-methyl-6-hydroxypyrid- 2-one l-phenyl-3-carbethoxy-4-phenyl-b-hydroxypyrid- Z-one 2:o-dihydroxy-3-carbonamido-4-methyl pyridine 2:6-dihydroxy-3-carbethoxy-4-methylpyridine 2:o-dihydroxy-3-carbondiethylamide-4 methyl pyridine 2zo-dihydroxy-3-carbonamide pyridine 2:o-dihydroxy-3-carbonamide-4-phenyl pyridine 2:6-dihydroxy-3-carbethoxy-4-phenyl pyridine 2zo-dihydroxy-3-cyano-4 carboethoxy pyridine 2zo-dihydroxy-3-cyano-4-carbamoyl pyridine ethyl 2:6-dihydroxy-3-cyano-pyrid-4-ylacetate, 2:6-dihydr0xy-3-cyano-pyrid-4-yl acetamide, 2:6-dihydroxy-3-cyanopyrid-4-yl acetdiethyl amide 2:6-dihydr0xy-3:4-di(carboethoxy)pyridine 2:6-dihydroxy-3-carbamoyl-4-carbethoxy pyridine 2:6-dihydroxy-3:4-di(carbamoyl) pyridine 2:6-dihydroxypyridine 2:6-dihydroxy-4-methylpyridine ethyl 2:6-dihydroxy iso-nicotinate 2:6-dihydr0xy iso-nicotinamide 2:6-dihydroxy iso-nicotinic acid diethylamide 2:6-dihydroxy-4-cyanopyridine 2:6dihydroxy-4-phenylpyridine 2:6-dihydroxy-4-(p-hydroxyphenyl)pyridine 2:6-dihydroxy-4-(p-methoxyphenyl)pyridine 3-cyano-4-methyl-2,o-dihydroxypyridine 4-methyl-2,6-dihydroxy pyridine 2,4,6-trihydroxy pyridine 3-cyan0-2,4,6-trihydroxy pyridine l-ethyl-3,4-dimethyl-6-hydroxypyrid-2-one l-B-hydroxyethyl-3-n-butyl-4-methyl-6- hydroxypyrid-3-one 1-B-aminoethyl-3,4-diethyl-6-hydroxypyrid-2-one l-ethyl-3,4-trimethylene6-hydroxypyrid2-one l-methyl-5-carbonamino-3,4-tetramethylene-6- hydroxypyrid-Z-one l-n-propyl-3 ,4-pentamethylene-6-hydroxypyrid- 2-one l-iso-butyl-4-methyl-3-nitro-6-hydroxypyrid-Z-onc l-lauryl-4methyl-3-nitro-o-hydroxypyrid-Z-one 4carboxy-3-nitro-2,6-dihydroxypyridine 4-aminocarbonyl-3-nitro-2,6-dihydroxypyridine 4-ethoxycarbonyl-3nitro-2,o-dihydroxypyridine lethyl-4-methyl-3-nitro-6-hydroxypyrid-2-one l,4-dimethyl-3-nitro-6-hydroxypyrid-2-onc l-ethyl-4-phenyl-3-nitro-o-hydroxypyrid-2-one l-phenyl-4-methyl-3-nitro6-hydroxypyrid-2-one l-benzyl-4-methyl-3-nitro-o-hydroxypyrid-Z-one 4'-nitrophenyl )-4-methyl-3-nitro-o-hydroxypyrid- Z-one l-( 4'-aminophenyl )4methyl-3-nitro-6- hydroxypyrid-2one l-cyelohexyl-4-methyl-3-nitro-6-hydroxypyrid-2-one 4-methyl-3nitro-2.o-dihydroxypyridinc l -n-propyl-4-methyl-3nitro-o-hydroxypyrid-Z-one l-isopropyl-4-methyl-3-nitro-6-hydroxypyrid-2-one l-( 3 -chlorophenyl )4-ethyl-3-nitro-o-hydroxypyrid- 2-one l-(4'-methylphenyl)-4-phenyl-3-nitro-6- hydroxypyrid2-onc l-( 3 ,5 '-dichlorophenyl )-4-methyl-nitro-ohydroxypyrid-Z-one l-anaphthyl-4-(4'-methoxyphenyl)-3-nitro-6- hydroxypyrid-Z-one l-(4'-methoxyphenyl)-4-phenyl-3-nitro-ohydroxypyrid-Z-one l- -methoxypropyll-methyl-3-nitro-ohydroxypyrid-Z-one l-methyl-4-phenyl-3-nitro-o-hydroxypyrid-Z-one l-n-butyl-4-methyl-3-nitro-o-hydroxypyrid-Z-one 3-aminol-ethyl-4-methyl-( -hydroxypyrid-Z-one l-ethyl-4-methyl-3-acety[amino-6-hydroxypyrid Z-one 6 1,4-dimethyl-3-acetylamino-6-hydroxypyrid-2-one l-ethyl-4-phenyl-3-acetylamino-6-hydroxypyrid- 2-one l -phenyl-4-methyl-3-acetylamino-6-hydroxypyrid- 2-one l-benzyl-4-methyl-3-benzoylamino-6-hydroxypyrid- 2-one 4-methyl-3-(4-methylphenylsulphonyl)amino-2,6-

dihydroxypyridine l-ethyl-4-methyl-3-chloro-6-hydroxypyrid-Z-one l-phenyl-4-methyl-3-chloro-6-hydroxypyrid-2-one l-(4-methylphenyl)-4-ethyl-3-chloro-6- hydroxypyrid-Z-one and l-( 2'-chlorophenyl)-4-phenyl-3-chloro-6- hydroxypyrid-Z-one Coupling agents wherein R and R taken together form a cyclic ring fused to the pyridone ring include isoquinoline-l ,3-di0ls or homophthalimides, for example 2-ethylisoquinoline-l ,3-di0l isoquinoline-l ,3-diol Z-y-dimethylaminopropylisoquinoline-1.3-diol drochloride 2-B-hydroxyethylisoquinoline-l .3-diol Z-B-acetylaminoethylisoquinoline-l .3-diol 2-phenyl isoquinolinel ,3-diol 2-4-methylphenylisoquinoline-1,3-diol 2-aminoisoquinoline-1,3-diol 2-phenylaminoisoquinolinel ,3-diol 2-3 '-chlorophenylisoquinolinel ,3-diol l -o-chlorophenyl-3-cyano-4-methyl-6-hydroxypyrid- 2-one l-p-chlorophenyl-3-eyand-4-methyl-o-hydroxypyrid- 2-one l-m-anisyl-3-cyano-4-methyl-6-hydroxypyrid-Z-one l-B-aminoethyl-3-cyano-4-methyl-6-hydroxypyrid- 2-one l-ethyl-4-methyl-6-hydroxypyrid-Z-one l-propyl-4-methyl-6-hydroxypyrid-2-one l-n-butyl-4-methyl-o-hydroxypyrid-2-one l-phenyl-4-methyl-b-hydroxypyrid-Z-one l-2-chlorophenyl-4-mcthyl-6-hydroxypyrid-2-one l-2'-methylphenyl-4-methyl-6-hydroxypyrid-Z-one l-4'-methylphenyl-4-methyl-b-hydroxypyrid-Z-one and l-B-aminoethyl-4-methyl-o-hydroxypyrid-l-one In an alternative method of preparation. dyestuffs of the invention wherein R represents a group of the formula CH(X)--CH --CONH where X is lower alkyl or hydrogen, for example the earbonamidoethyl may be made by reacting an insoluble azo dyestuff of formula ll with a compound of the formula Cl-l(X)- CHC()NH in the presence of acid. for example organic or mineral acid or a mixture thereof. The method is described in US. Pat. No. 3,l3Z,l32. Compounds of the above formula include acrylamide. and inethacrylamide. By the term lower alkyl we mean having from one to four carbon atoms.

The dyestuffs of the present invention may be applied to polymeric textile materials from an aqueous bath. The present dyestuffs give valuable bright shades of high tinctorial strength and possess rapid dyeing characteristics.

In particular the dyestuffs of the invention are valuable for dyeing polyacrylonitrile materials and may be applied to polyacrylonitrile materials from acid. neutral or slightly alkaline dyebaths (i.e., pH from 3-8) at tem peratures between 40-120C and preferably between 80l20C or by printing techniques using thickened print pastes. Dyeings of good fastness properties to washing and light are obtained.

The invention is illustrated, but not limited by the following Examples in which all parts and percentages are be weight unless otherwise stated.

EXAMPLE 1 4.2 Parts of a dyestuff of formula:

CH B C S 3 are suspended in 78 parts of monochlorobenzene at 110C, and 3.4 parts of dimethyl sulphate are added. 25

The mixture is heated at lOO-l 10C for 18 hours, and the precipitated dyestuff filtered off. This is purified by redissolving in 200 parts of hot water, filtereng hot and salting the filtrate.

When applied to polyacrylonitrile fibre from a neutral or weakly acidic dyebath, the dyestuff produces very bright greenish-yellow shade with good fastness properties.

EXAMPLE 2 4.3 Parts of a dyestuff of formula:

CH H C are reacted with dimethyl sulphate in a similar manner to that described in Example 1.

The dyestuff produced, when applied to polyacrylonitrile fibre from neutral or weakly acidic dyebaths, yields a greenish-yellow shade, (somewhat redder than that obtained from the dyestuff described in Example 1) with good fastness properties.

The following similar dyestuffs are obtained in a similar manner to that outlined in Example 1 using the reactants shown.

Example Water-insoluble dye Shade on Alkyhting Agent polyacrylonitrile B c 5 3 com I.. o 2

dimethyl sulphate greenish-yellow u 5 I CH3 I I a c s 0H no N o dimethyl sulphate II II diothyl sulphate C ontmued Alkylating Shade on Example Diazo Component Coupling Component Agent Polyacrylonitrilc 3O 2-( 4'-amino-3 '-methoxyl-ethyl-3 -cyano-4-rnethyl-6- phenyl )-6-ethoxybenzthiazole hydroxypyrid-Z-one 3l 2-(4-aminophenyl)-6- l-n-propyl-4methyl-6- methylbenzthiazole. hydroxypyrid-Z-one v 32 l-n-butyl-4-mcthyl-6- hydroxypyrid-Z-one 3 3 l-phenyl-4-methyl-6- hydroxypyrid-Z-one 34 41 l-2 -chlorophenyl-4-methyl-6 hydroxypyrid-2-one 35 l-4'-chlorophenyl-4-methyl-6- hydroxypyrid-Z-one 36 l-2'-methylphenyl-4-methyl-6- hydroxypyrid-Z-one 37 l-B-aminoethyl-4-methyl6- hydroxypyrid-Z-one 38 l-methyl-3-chloro-4-methyl-6- hydroxypyrid-Z-one 39 l-e!hyl-3-nitro-4-methyl-6- Yellow hydroxypyrid-Z-one 40 l-methyl-3-carbonamido-4- Greenish-yellow methyl-6-hydroxypyrid-2-one 4i l-mcthyl-3-butyl-4-methyl-6- hydroxypyrid-Z-one 42 l-ethyl-3-buty!-4'methyl-6- Methyl phydroxypyrid-2-one toluene sulphonate 43 l ethyl-3,4-trimethylene-6- Diethyl hydroxypyrid-Z-one sulphate 44 l-methyl-3,4-tctramethylene-5- carbonamido-6-hydroxypyrid-2-one 45 l-n-propyl-3 ,4-pentamethylene-6- Dimethyl hydroxypyrid-Z-one sulphate 46 lsoquinoline-l ,3-diol 47 Z-ethylisoquinoline-l 3-diol 48 Z-B-hydroxyethylisoquinolinel, 'ol 49 2-phenylisoquinolinel ,3-diol 5O l-ethyl-3-acetylamino-4-methyl- 6hydroxypyrid-2-one 5 l 1-ethyl-3-amino4-methyl-6- Yellow hydroxypyrid-Z-one 5 2 2-( 2 -aminophcnyl )-5- l-ethyl-3-cyano-4-methyl-6- Greenish-yellow methylbenzthiazole hydroxypyrid-Z-one 53 2-(2-aminophenyl)-6- methylbenzthiazole 54 2-(2-aminophcnyl)-4- methylbenzthiazole 5 5 2-( 4'-amin0-3 '-methylphenyl )-4,6-dimethyl benzthiazole 56 2-(4-aminophenyl)-6- l-phenyl-3-carbethoxy-4-methylmethylbenzthiazole 6-hydroxypyrid-2-one 57 l-phenyl-3-carbethoxy-4-phenyl- 6-hydroxypyrid-2-one 58 l-phenyl-3-carbonamido-4-phenyl- 6-hydroxypyrid-2-one 59 l -phenyl-3-cyano-4-phenylv -hydroxypyn'd-Z-one 60 2,6-dihydroxy-3-carbonamido- 4-methylpyridine 6l 2,6-dihydroxy-3-cyano-4- methylpyridine 62 2,6-dihydroxy-3-carbethoxy-4- methylpyn'dine 63 2.6-dihydroxy-4-methylpyridine 64 2,6-dihydroxy-iso-nicotinamide EXAMPLE 65 acid are added and the mixture stirred and heated at 4 parts of a dyestuff of formula:

is dissolved in 36 parts of acetic acid, and 7.1 parts of for 18 hours, and poured into 400 parts of water. The mixture is filtered and the residue extracted with 400 parts of boiling water. The combined filtrate and aqueous extract is treated with sodium chloride and zinc chloride, and the precipitated dyestuff separated, washed with a little 10% brine and dried.

When dyed on to polyacrylonitrile fibre from neutral or weakly acidic dyebaths, a bright greenish-yellow shade with good light fastness is obtained.

What we claim is:

1. Water-soluble azo dyestuff devoid of carboxylic acrylamide added. 1.2 parts of 30 percent hydrochloric 65 acid or sulphonic acid groups of the formula G R3 X S\ )n 2 h H i O R R wherein ethoxy,

R represents methyl, ethyl, benzyl 0r carbonamido- X represents an anion, and

ethyl, m and n are integers from 1-3. R represents hydrogen, amino, methyl, ethyl, propyl, 2. The azo dyestuff of claim 1 of the formula S H C Ll l R R R1 butyl, hydroxyethyl, aminoethyl, benzyl, naphthyl, herein phenyl, chlorophenyl, tolyl, nitrophenyl or meth- R, R, R and X are as defined in claim 5, oxy phenyl, R is hydrogen, cyano and methyl and R represents hydrogen, cyano, methyl, chloro, R is hydrogen, methyl, ethyl or phenyl.

amino, acetylamino, carboethoxy or carbonamido,

R3 represents hydrogen methyl ethyl or henyl or 3- The 2.20 dyestuff Of claim 1 wherein X is chloride,

R and R tak t th i h h Carbon atoms to bromide, iodide, tetrachlorozincate, bisulphate, niwhich they are attach d form a benzene ri trate, sulphate, sulphamate, phosphate, borate, acetate,

R represents hydrogen, methyl, chloro or methoxy, propionate, methylsulphate and p-tolylsulphonate. R represents hydrogen, methyl, chloro, methoxy 0r 

1. WATER-SOLUBLE AZO DYESTUFF DEVOID OF CARBOXYLIC ACID OR SULPHONIC ACID GROUPS OF THE FORMULA
 2. The azo dyestuff of claim 1 of the formula
 3. The azo dyestuff of claim 1 wherein X is chloride, bromide, iodide, tetrachlorozincate, bisulphate, nitrate, sulphate, sulphamate, phosphate, borate, acetate, propionate, methylsulphate and p-tolylsulphonate. 